Optical fiber laser device and optical fiber laser providing method

Abstract

Disclosed herein is an optical fiber laser device including a seed unit for providing at least two seed lights having different wavelengths; and an amplifying unit for amplifying the at least two seed lights. The amplifying unit includes: a preamplifying unit for amplifying the at least two seed lights by using excitation light of which the wavelength is shorter than the wavelengths of the seed lights; and a final amplifying unit to which no separate excitation light source is provided. The final amplifying unit amplifies the seed light having the longest wavelength by using the other seed light as excitation light with respect to the seed light having the longest wavelength among the at least two seed light.

The invention claimed is: 
     
       1. An optical fiber laser apparatus comprising:
 a seed unit configured to provide at least two seed lights, wherein the at least two seed lights comprise:
 a first seed light having a first wavelength, wherein an optical signal of the first seed light is in a form of a pulse having time periods of no incidence of the optical signal and incidence of the optical signal; and 
 a second seed light having a second wavelength, wherein an optical signal of the second seed light is in a form of a continuous wave output having time period of incidence of the optical signal; 
 
 a pre-amplifying unit comprising an excitation light source and a first amplifying optical fiber, wherein
 the excitation light source is configured to provide an pre-amplifying excitation light having a third wavelength, 
 the third wavelength is shorter than the first wavelength and the second wavelength, and 
 the pre-amplifying unit is further configured to amplify the first seed light and the second seed light at the same time during time period of incidence of the optical signal of the first seed light and amplify the second seed light during time period of no incidence of the optical signal of the first seed light using the pre-amplifying excitation light as an excitation light; 
 
 an amplifying unit comprising a second amplifying optical fiber, wherein the amplifying unit is configured to amplify the first seed light using the optical signal of the amplified second seed light as an excitation light; and 
 a controller comprising at least a synchronization driver configured to synchronize the at least two seed lights, 
 wherein the first amplifying optical fiber is configured to carry out amplification in a manner of exciting a clad and the second amplifying optical fiber is configured to carry out amplification in a manner of exciting a core. 
 
     
     
       2. The optical fiber laser apparatus of  claim 1 , wherein the amplifying unit comprises an amplifying optical fiber comprising an Large-Mode-Area Double Clad Fiber (LMA DCF), and wherein the amplifying unit is configured to amplify the first seed light in the amplifying optical fiber. 
     
     
       3. The optical fiber laser apparatus of  claim 1 , wherein the seed unit is configured to provide two seed lights, wherein pre-amplifying unit or the amplifying unit comprises an amplifying optical fiber, the amplifying optical fiber is doped with Ytterbium (Yb), wherein the first wavelength ranges from 1030 nm to 1080 nm, and the second wavelength ranges from 915 nm to 940 nm. 
     
     
       4. The optical fiber laser apparatus of  claim 1 , wherein the at least two seed lights comprise a third seed light, and wherein an optical signal of the third seed light is a form of a continuous wave output. 
     
     
       5. The optical fiber laser apparatus of  claim 1 , wherein the pre-amplifying unit and the amplifying unit are provided with amplifying optical fiber, both the amplifying optical fibers are doped with the identical or different rare earth elements, and the rare earth element comprises at least one of Yb, Nd, Er and Tm. 
     
     
       6. A method of providing optical fiber laser comprising:
 providing, by a seed unit, at least two seed lights having different wavelengths, wherein the at least two seed light comprise:
 a first seed light having a first wavelength, wherein an optical signal of the first seed light is in a form of a pulse having time periods of no incidence of the optical signal and incidence of the optical signal; and 
 a second seed light having a second wavelength, wherein an optical signal of the second seed light is in a form of a continuous wave output having time period of incidence of the optical signal, wherein the second seed light has a wavelength shorter than a wavelength of the first seed light; 
 
 synchronizing, by a controller comprising at least a synchronization driver, the at least two seed lights; 
 pre-amplifying, by a pre-amplifying unit, the at least two seed lights from the seed unit at the same time during time period of incidence of the optical signal of the first seed light and amplify the second seed light during time period of no incidence of the optical signal of the first seed light by means of excitation light of which wavelength is different from that of the at least two seed lights by utilizing a first amplifying optical fiber; 
 amplifying, by an amplifying unit, the first seed light using the optical signal of the amplified second seed light in a second amplifying optical fiber; and 
 emitting the amplified first seed light, 
 wherein the first amplifying optical fiber carries out amplification in a manner of exciting a clad and the second amplifying optical fiber carries out amplification in a manner of exciting a core.